The problem of exploitation planning refers to A criterion used to optimize the open pit. In spite of sophisticated algorithms, the problem of optimization is always an economic problem, within which ...the procedures for assessment the necessary economic parameters are defined. Every ore body is different, but the main steps in planning an open pit, when the main objective is to make a profit, are developed by the same principle. When planning the copper ore exploitation, the final economic result depends on the overall technological process of copper obtaining copper as a final product.This work present an economic analysis of the copper ore exploitation on the Cerovo Primarno-Drenova deposit for athe nnual capacity of flotation processing of 6.0 and 12.0 million tons, using the software for economic analysis and long-term planning of open pits Whittle surface (Dassault Systèmes-Geovia).
Sequence stratigraphy of fluvial deposits is a controversial topic because changes in relative sea level will eventually have indirect impact on the spatial and temporal distribution of depositional ...facies. Changes in the relative sea level may influence the accommodation space in fluvial plains, and hence have impact on types of fluvial system, frequency of avulsion, and style of vertical and lateral accretion. This study aims to investigate whether depositional facies and changes in the fluvial system of the Lower Triassic Petrohan Terrigenous Group sandstones (NW Bulgaria) in response to changes in the relative sea level have an impact on the spatial and temporal distribution of diagenetic alterations.
Eogenetic alterations, which were encountered in the fluvial sandstones, include: (i) mechanically infiltrated clays, particularly in channel and crevasse splay sandstones towards the top of the lowstand systems tract (LST) and the base of the highstand systems tract (HST). (ii) Pseudomatrix, which resulted from mechanical compaction of mud intraclasts, occurs mainly in channel sandstones at the base of the LST and towards the top of the HST and thus led to porosity and permeability deterioration. (iii) Calcite (δ
18O
VPDB
=
−8.1‰ to −7.5‰ and δ
13C
VPDB
=
−7.8‰ to −6.3‰) and dolomite (δ
18O
VPDB
=
−8.3‰ to −5.2‰ and δ
13C
VPDB
=
−8.3‰ to −7.1‰), which are associated with palaeosol horizons developed on top of crevasse splay and channel sandstones of transgressive systems tract (TST) and LST. Such extensive eogenetic calcite cements may act as potential layers for the formation of reservoir compartments for underlying sandstones.
Mesogenetic alterations include: (i) calcite (δ
18O
VPDB
=
−18.4‰ to −12.8‰ and δ
13C
VPDB
=
−8.6‰ to −6.8‰) and dolomite (δ
18O
VPDB
=
−14.7‰ to −12.4‰ and δ
13C
VPDB
=
−8.0‰ to −7.0‰), which were formed in all depositional facies and systems tract sandstones, (ii) illite, which is the dominant diagenetic clay mineral in all depositional facies and systems tracts, was associated with albitization of detrital K-feldspars, and (iii) quartz overgrowths, which are most abundant in TST rather than LST and HST sandstones, because of the presence of suitable infiltrated clays and pseudomatrix in the latter sandstones. Such cementation by calcite, dolomite, and quartz overgrowths and formation of illite led to porosity and permeability deterioration during mesodiagenesis.
The results of this study revealed the importance of integration of diagenesis with depositional facies and sequence stratigraphy of fluvial sandstones in improving our ability to predict the spatial and temporal distribution of eogenetic alterations and their subsequent impact on mesogenetic alterations, and thus on reservoir quality modifications.
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